Add Open in T3 Code to Windows context menu and project launch

[adityavardhansharma]

What Changed

• Windows installer: Added "Open in T3 Code" to the Explorer context menu (folder and folder background) via NSIS installer.nsh and wired it into the desktop build.
• Desktop: Implemented handling for opening a folder in T3 Code from the shell (e.g. windowsProjectLaunch.ts, main process, preload, and IPC in packages/contracts).
• Web: Sidebar (or entry point) updated so the app can open and show the launched project when started from the context menu.
• Build: scripts/build-desktop-artifact.ts updated to include the installer script so the context menu is registered on install and removed on uninstall.

Why

Users expect to right‑click a folder in Windows Explorer and choose "Open in T3 Code" after installation. This adds that flow: installer registers the context menu, and the desktop app handles the launch and shows the correct project in the UI.

UI Changes

• Context menu: After install, right‑clicking a folder (or the folder background) in Explorer shows "Open in T3 Code" in the context menu. No before screenshot (new feature).

  

  **Video **

Recording.2026-03-13.004744.mp4

Checklist

• This PR is small and focused
• I explained what changed and why
• I included before/after screenshots for any UI changes
• I included a video for animation/interaction changes

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